Mass Mysteries HomeworkMass Mysteries Chemistry Lab 05 Name: Date: Part 1: Lab Concepts A scientist mixes 15g of baking soda with 30g of vinegar in a tightly sealed flask. After the bubbling stops, what will be the total mass of the contents inside the flask? 15 grams 30 grams 45 grams 60 grams 2. True or False: If a chemical reaction forms a new substance, the total mass will increase. T F Complete the statement: The Law of Conservation of Mass states that matter cannot be or during a reaction. Part 2: CER Challenge "A student placed a shiny iron nail in a jar of water and sealed it tight. The total mass was 120 grams. After one week, the nail was covered in a crumbly red substance (rust). The student weighed the sealed jar again." Claim (What happened to the mass?) Evidence (Observations) Reasoning (Scientific Principles) Homework Edition: Chemical Reactions & Conservation
Reaction Blast Morning WorkReaction Blast Morning Work: 05 Name: Date: 1 Quick Check (Multiple Choice) A teacher mixes two clear liquids in a sealed bottle that has a mass of 450 grams. A white solid forms at the bottom. What is the total mass after the reaction? Less than 450 grams Exactly 450 grams More than 450 grams Mass cannot be measured 2 True or False A new smell or a change in odor is reliable evidence that a chemical reaction has occurred. T F 3 Lab Vocab A system prevents any matter from escaping or entering during an experiment. 4 Lab Reasoning (Mini CER) Scenario: Maya mixes 10g of salt into 100g of water. She stirs it until the salt is completely dissolved. Final Mass? Chemical reaction? Claim (Mass & Change Type) Evidence & Reasoning Reaction Lab Mastery | Morning Work Edition
Reaction Mastery KeysAnswer Keys Teacher Resource Reaction Blast (Morning Work) 1. Multiple Choice Exactly 450 grams 2. True or False True (Smell is evidence) 3. Lab Vocab closed system 4. Mini CER (Salt Mixture) Claim: 110g. This is a physical change (mixture), NOT a chemical reaction. Reasoning: 10g + 100g = 110g. No new substance formed; salt only dissolved in water. Mass Mysteries (Homework) 1. Multiple Choice 45 grams 2. True or False False (Mass stays same) 3. Statement created / destroyed Part 2: CER Challenge (Rusting Nail) Claim: The mass remained 120 grams. A chemical reaction did occur. Evidence: Color and texture change (red rust substance formed). Reasoning: Rusting is a chemical reaction that creates a new substance. In a sealed jar, the total mass must be conserved (Law of Conservation of Mass).
